cregit-Linux how code gets into the kernel

Release 4.10 fs/nilfs2/inode.c

Directory: fs/nilfs2
/*
 * inode.c - NILFS inode operations.
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by Ryusuke Konishi.
 *
 */

#include <linux/buffer_head.h>
#include <linux/gfp.h>
#include <linux/mpage.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/uio.h>
#include "nilfs.h"
#include "btnode.h"
#include "segment.h"
#include "page.h"
#include "mdt.h"
#include "cpfile.h"
#include "ifile.h"

/**
 * struct nilfs_iget_args - arguments used during comparison between inodes
 * @ino: inode number
 * @cno: checkpoint number
 * @root: pointer on NILFS root object (mounted checkpoint)
 * @for_gc: inode for GC flag
 */

struct nilfs_iget_args {
	
u64 ino;
	
__u64 cno;
	
struct nilfs_root *root;
	
int for_gc;
};

static int nilfs_iget_test(struct inode *inode, void *opaque);




void nilfs_inode_add_blocks(struct inode *inode, int n)
{
	struct nilfs_root *root = NILFS_I(inode)->i_root;

	inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
	if (root)
		atomic64_add(n, &root->blocks_count);
}


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ryusuke konishiryusuke konishi5398.15%150.00%


vyacheslav dubeykovyacheslav dubeyko11.85%150.00%


Total54100.00%2100.00%






void nilfs_inode_sub_blocks(struct inode *inode, int n)
{
	struct nilfs_root *root = NILFS_I(inode)->i_root;

	inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
	if (root)
		atomic64_sub(n, &root->blocks_count);
}


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ryusuke konishiryusuke konishi5398.15%150.00%


vyacheslav dubeykovyacheslav dubeyko11.85%150.00%


Total54100.00%2100.00%



/**
 * nilfs_get_block() - get a file block on the filesystem (callback function)
 * @inode - inode struct of the target file
 * @blkoff - file block number
 * @bh_result - buffer head to be mapped on
 * @create - indicate whether allocating the block or not when it has not
 *      been allocated yet.
 *
 * This function does not issue actual read request of the specified data
 * block. It is done by VFS.
 */



int nilfs_get_block(struct inode *inode, sector_t blkoff,
		    struct buffer_head *bh_result, int create)
{
	struct nilfs_inode_info *ii = NILFS_I(inode);
	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
	__u64 blknum = 0;
	int err = 0, ret;
	unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;

	down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
	ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
	up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
	if (ret >= 0) {	/* found */
		map_bh(bh_result, inode->i_sb, blknum);
		if (ret > 0)
			bh_result->b_size = (ret << inode->i_blkbits);
		goto out;
	}
	/* data block was not found */
	if (ret == -ENOENT && create) {
		struct nilfs_transaction_info ti;

		bh_result->b_blocknr = 0;
		err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
		if (unlikely(err))
			goto out;
		err = nilfs_bmap_insert(ii->i_bmap, blkoff,
					(unsigned long)bh_result);
		if (unlikely(err != 0)) {
			if (err == -EEXIST) {
				/*
                                 * The get_block() function could be called
                                 * from multiple callers for an inode.
                                 * However, the page having this block must
                                 * be locked in this case.
                                 */
				nilfs_msg(inode->i_sb, KERN_WARNING,
					  "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
					  __func__, inode->i_ino,
					  (unsigned long long)blkoff);
				err = 0;
			}
			nilfs_transaction_abort(inode->i_sb);
			goto out;
		}
		nilfs_mark_inode_dirty_sync(inode);
		nilfs_transaction_commit(inode->i_sb); /* never fails */
		/* Error handling should be detailed */
		set_buffer_new(bh_result);
		set_buffer_delay(bh_result);
		map_bh(bh_result, inode->i_sb, 0);
		/* Disk block number must be changed to proper value */

	} else if (ret == -ENOENT) {
		/*
                 * not found is not error (e.g. hole); must return without
                 * the mapped state flag.
                 */
		;
	} else {
		err = ret;
	}

 out:
	return err;
}


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ryusuke konishiryusuke konishi33099.70%1090.91%


andreas rohnerandreas rohner10.30%19.09%


Total331100.00%11100.00%



/**
 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
 * address_space_operations.
 * @file - file struct of the file to be read
 * @page - the page to be read
 */



static int nilfs_readpage(struct file *file, struct page *page)
{
	return mpage_readpage(page, nilfs_get_block);
}


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ryusuke konishiryusuke konishi24100.00%1100.00%


Total24100.00%1100.00%



/**
 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
 * address_space_operations.
 * @file - file struct of the file to be read
 * @mapping - address_space struct used for reading multiple pages
 * @pages - the pages to be read
 * @nr_pages - number of pages to be read
 */



static int nilfs_readpages(struct file *file, struct address_space *mapping,
			   struct list_head *pages, unsigned int nr_pages)
{
	return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
}


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ryusuke konishiryusuke konishi37100.00%2100.00%


Total37100.00%2100.00%






static int nilfs_writepages(struct address_space *mapping,
			    struct writeback_control *wbc)
{
	struct inode *inode = mapping->host;
	int err = 0;

	if (inode->i_sb->s_flags & MS_RDONLY) {
		nilfs_clear_dirty_pages(mapping, false);
		return -EROFS;
	}

	if (wbc->sync_mode == WB_SYNC_ALL)
		err = nilfs_construct_dsync_segment(inode->i_sb, inode,
						    wbc->range_start,
						    wbc->range_end);
	return err;
}


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ryusuke konishiryusuke konishi6072.29%266.67%


vyacheslav dubeykovyacheslav dubeyko2327.71%133.33%


Total83100.00%3100.00%






static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
{
	struct inode *inode = page->mapping->host;
	int err;

	if (inode->i_sb->s_flags & MS_RDONLY) {
		/*
                 * It means that filesystem was remounted in read-only
                 * mode because of error or metadata corruption. But we
                 * have dirty pages that try to be flushed in background.
                 * So, here we simply discard this dirty page.
                 */
		nilfs_clear_dirty_page(page, false);
		unlock_page(page);
		return -EROFS;
	}

	redirty_page_for_writepage(wbc, page);
	unlock_page(page);

	if (wbc->sync_mode == WB_SYNC_ALL) {
		err = nilfs_construct_segment(inode->i_sb);
		if (unlikely(err))
			return err;
	} else if (wbc->for_reclaim)
		nilfs_flush_segment(inode->i_sb, inode->i_ino);

	return 0;
}


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ryusuke konishiryusuke konishi9276.03%150.00%


vyacheslav dubeykovyacheslav dubeyko2923.97%150.00%


Total121100.00%2100.00%






static int nilfs_set_page_dirty(struct page *page)
{
	struct inode *inode = page->mapping->host;
	int ret = __set_page_dirty_nobuffers(page);

	if (page_has_buffers(page)) {
		unsigned int nr_dirty = 0;
		struct buffer_head *bh, *head;

		/*
                 * This page is locked by callers, and no other thread
                 * concurrently marks its buffers dirty since they are
                 * only dirtied through routines in fs/buffer.c in
                 * which call sites of mark_buffer_dirty are protected
                 * by page lock.
                 */
		bh = head = page_buffers(page);
		do {
			/* Do not mark hole blocks dirty */
			if (buffer_dirty(bh) || !buffer_mapped(bh))
				continue;

			set_buffer_dirty(bh);
			nr_dirty++;
		} while (bh = bh->b_this_page, bh != head);

		if (nr_dirty)
			nilfs_set_file_dirty(inode, nr_dirty);
	} else if (ret) {
		unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);

		nilfs_set_file_dirty(inode, nr_dirty);
	}
	return ret;
}


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ryusuke konishiryusuke konishi10673.61%360.00%


andreas rohnerandreas rohner3725.69%120.00%


kirill a. shutemovkirill a. shutemov10.69%120.00%


Total144100.00%5100.00%






void nilfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		nilfs_truncate(inode);
	}
}


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marco stornellimarco stornelli46100.00%1100.00%


Total46100.00%1100.00%






static int nilfs_write_begin(struct file *file, struct address_space *mapping,
			     loff_t pos, unsigned len, unsigned flags,
			     struct page **pagep, void **fsdata)

{
	struct inode *inode = mapping->host;
	int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);

	if (unlikely(err))
		return err;

	err = block_write_begin(mapping, pos, len, flags, pagep,
				nilfs_get_block);
	if (unlikely(err)) {
		nilfs_write_failed(mapping, pos + len);
		nilfs_transaction_abort(inode->i_sb);
	}
	return err;
}


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ryusuke konishiryusuke konishi10390.35%250.00%


christoph hellwigchristoph hellwig87.02%125.00%


marco stornellimarco stornelli32.63%125.00%


Total114100.00%4100.00%






static int nilfs_write_end(struct file *file, struct address_space *mapping,
			   loff_t pos, unsigned len, unsigned copied,
			   struct page *page, void *fsdata)
{
	struct inode *inode = mapping->host;
	unsigned int start = pos & (PAGE_SIZE - 1);
	unsigned int nr_dirty;
	int err;

	nr_dirty = nilfs_page_count_clean_buffers(page, start,
						  start + copied);
	copied = generic_write_end(file, mapping, pos, len, copied, page,
				   fsdata);
	nilfs_set_file_dirty(inode, nr_dirty);
	err = nilfs_transaction_commit(inode->i_sb);
	return err ? : copied;
}


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ryusuke konishiryusuke konishi11599.14%375.00%


kirill a. shutemovkirill a. shutemov10.86%125.00%


Total116100.00%4100.00%





static ssize_t

nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
	struct inode *inode = file_inode(iocb->ki_filp);

	if (iov_iter_rw(iter) == WRITE)
		return 0;

	/* Needs synchronization with the cleaner */
	return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
}


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ryusuke konishiryusuke konishi3871.70%120.00%


al viroal viro1120.75%360.00%


omar sandovalomar sandoval47.55%120.00%


Total53100.00%5100.00%




const struct address_space_operations nilfs_aops = {
	.writepage		= nilfs_writepage,
	.readpage		= nilfs_readpage,
	.writepages		= nilfs_writepages,
	.set_page_dirty		= nilfs_set_page_dirty,
	.readpages		= nilfs_readpages,
	.write_begin		= nilfs_write_begin,
	.write_end		= nilfs_write_end,
	/* .releasepage         = nilfs_releasepage, */
	.invalidatepage		= block_invalidatepage,
	.direct_IO		= nilfs_direct_IO,
	.is_partially_uptodate  = block_is_partially_uptodate,
};




static int nilfs_insert_inode_locked(struct inode *inode,
				     struct nilfs_root *root,
				     unsigned long ino)
{
	struct nilfs_iget_args args = {
		.ino = ino, .root = root, .cno = 0, .for_gc = 0
	};

	return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
}


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ryusuke konishiryusuke konishi59100.00%1100.00%


Total59100.00%1100.00%






struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
{
	struct super_block *sb = dir->i_sb;
	struct the_nilfs *nilfs = sb->s_fs_info;
	struct inode *inode;
	struct nilfs_inode_info *ii;
	struct nilfs_root *root;
	int err = -ENOMEM;
	ino_t ino;

	inode = new_inode(sb);
	if (unlikely(!inode))
		goto failed;

	mapping_set_gfp_mask(inode->i_mapping,
			   mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));

	root = NILFS_I(dir)->i_root;
	ii = NILFS_I(inode);
	ii->i_state = BIT(NILFS_I_NEW);
	ii->i_root = root;

	err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
	if (unlikely(err))
		goto failed_ifile_create_inode;
	/* reference count of i_bh inherits from nilfs_mdt_read_block() */

	atomic64_inc(&root->inodes_count);
	inode_init_owner(inode, dir, mode);
	inode->i_ino = ino;
	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);

	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
		err = nilfs_bmap_read(ii->i_bmap, NULL);
		if (err < 0)
			goto failed_after_creation;

		set_bit(NILFS_I_BMAP, &ii->i_state);
		/* No lock is needed; iget() ensures it. */
	}

	ii->i_flags = nilfs_mask_flags(
		mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);

	/* ii->i_file_acl = 0; */
	/* ii->i_dir_acl = 0; */
	ii->i_dir_start_lookup = 0;
	nilfs_set_inode_flags(inode);
	spin_lock(&nilfs->ns_next_gen_lock);
	inode->i_generation = nilfs->ns_next_generation++;
	spin_unlock(&nilfs->ns_next_gen_lock);
	if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
		err = -EIO;
		goto failed_after_creation;
	}

	err = nilfs_init_acl(inode, dir);
	if (unlikely(err))
		/*
                 * Never occur.  When supporting nilfs_init_acl(),
                 * proper cancellation of above jobs should be considered.
                 */
		goto failed_after_creation;

	return inode;

 failed_after_creation:
	clear_nlink(inode);
	unlock_new_inode(inode);
	iput(inode);  /*
                       * raw_inode will be deleted through
                       * nilfs_evict_inode().
                       */
	goto failed;

 failed_ifile_create_inode:
	make_bad_inode(inode);
	iput(inode);
 failed:
	return ERR_PTR(err);
}


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ryusuke konishiryusuke konishi36895.83%1062.50%


deepa dinamanideepa dinamani41.04%16.25%


dmitriy monakhovdmitriy monakhov41.04%16.25%


miklos szeredimiklos szeredi30.78%16.25%


michal hockomichal hocko30.78%16.25%


al viroal viro10.26%16.25%


vyacheslav dubeykovyacheslav dubeyko10.26%16.25%


Total384100.00%16100.00%






void nilfs_set_inode_flags(struct inode *inode)
{
	unsigned int flags = NILFS_I(inode)->i_flags;
	unsigned int new_fl = 0;

	if (flags & FS_SYNC_FL)
		new_fl |= S_SYNC;
	if (flags & FS_APPEND_FL)
		new_fl |= S_APPEND;
	if (flags & FS_IMMUTABLE_FL)
		new_fl |= S_IMMUTABLE;
	if (flags & FS_NOATIME_FL)
		new_fl |= S_NOATIME;
	if (flags & FS_DIRSYNC_FL)
		new_fl |= S_DIRSYNC;
	inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
			S_NOATIME | S_DIRSYNC);
}


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ryusuke konishiryusuke konishi94100.00%3100.00%


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int nilfs_read_inode_common(struct inode *inode,
			    struct nilfs_inode *raw_inode)
{
	struct nilfs_inode_info *ii = NILFS_I(inode);
	int err;

	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
	i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
	i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
	set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
	inode->i_size = le64_to_cpu(raw_inode->i_size);
	inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
	inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
	inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	if (inode->i_nlink == 0)
		return -ESTALE; /* this inode is deleted */

	inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
	ii->i_flags = le32_to_cpu(raw_inode->i_flags);
#if 0
	ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
        ii->i_dir_acl = S_ISREG(inode->i_mode) ?
                0 : le32_to_cpu(raw_inode->i_dir_acl);
#endif
	ii->i_dir_start_lookup = 0;
	inode->i_generation = le32_to_cpu(raw_inode->i_generation);

	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	    S_ISLNK(inode->i_mode)) {
		err = nilfs_bmap_read(ii->i_bmap, raw_inode);
		if (err < 0)
			return err;
		set_bit(NILFS_I_BMAP, &ii->i_state);
		/* No lock is needed; iget() ensures it. */
	}
	return 0;
}


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ryusuke konishiryusuke konishi26995.73%466.67%


eric w. biedermaneric w. biederman82.85%116.67%


miklos szeredimiklos szeredi41.42%116.67%


Total281100.00%6100.00%






static int __nilfs_read_inode(struct super_block *sb,
			      struct nilfs_root *root, unsigned long ino,
			      struct inode *inode)
{
	struct the_nilfs *nilfs = sb->s_fs_info;
	struct buffer_head *bh;
	struct nilfs_inode *raw_inode;
	int err;

	down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
	err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
	if (unlikely(err))
		goto bad_inode;

	raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);

	err = nilfs_read_inode_common(inode, raw_inode);
	if (err)
		goto failed_unmap;

	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &nilfs_file_inode_operations;
		inode->i_fop = &nilfs_file_operations;
		inode->i_mapping->a_ops = &nilfs_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &nilfs_dir_inode_operations;
		inode->i_fop = &nilfs_dir_operations;
		inode->i_mapping->a_ops = &nilfs_aops;
	} else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &nilfs_symlink_inode_operations;
		inode_nohighmem(inode);
		inode->i_mapping->a_ops = &nilfs_aops;
	} else {
		inode->i_op = &nilfs_special_inode_operations;
		init_special_inode(
			inode, inode->i_mode,
			huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
	}
	nilfs_ifile_unmap_inode(root->ifile, ino, bh);
	brelse(bh);
	up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
	nilfs_set_inode_flags(inode);
	mapping_set_gfp_mask(inode->i_mapping,
			   mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
	return 0;

 failed_unmap:
	nilfs_ifile_unmap_inode(root->ifile, ino, bh);
	brelse(bh);

 bad_inode:
	up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
	return err;
}


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ryusuke konishiryusuke konishi32697.60%777.78%


al viroal viro51.50%111.11%


michal hockomichal hocko30.90%111.11%


Total334100.00%9100.00%






static int nilfs_iget_test(struct inode *inode, void *opaque)
{
	struct nilfs_iget_args *args = opaque;
	struct nilfs_inode_info *ii;

	if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
		return 0;

	ii = NILFS_I(inode);
	if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
		return !args->for_gc;

	return args->for_gc && args->cno == ii->i_cno;
}


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ryusuke konishiryusuke konishi90100.00%2100.00%


Total90100.00%2100.00%






static int nilfs_iget_set(struct inode *inode, void *opaque)
{
	struct nilfs_iget_args *args = opaque;

	inode->i_ino = args->ino;
	if (args->for_gc) {
		NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
		NILFS_I(inode)->i_cno = args->cno;
		NILFS_I(inode)->i_root = NULL;
	} else {
		if (args->root && args->ino == NILFS_ROOT_INO)
			nilfs_get_root(args->root);
		NILFS_I(inode)->i_root = args->root;
	}
	return 0;
}


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ryusuke konishiryusuke konishi106100.00%3100.00%


Total106100.00%3100.00%






struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
			    unsigned long ino)
{
	struct nilfs_iget_args args = {
		.ino = ino, .root = root, .cno = 0, .for_gc = 0
	};

	return ilookup5(sb, ino, nilfs_iget_test, &args);
}


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Total60100.00%1100.00%






struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
				unsigned long ino)
{
	struct nilfs_iget_args args = {
		.ino = ino, .root = root, .cno = 0, .for_gc = 0
	};

	return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
}


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struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
			 unsigned long ino)
{
	struct inode *inode;
	int err;

	inode = nilfs_iget_locked(sb, root, ino);
	if (unlikely(!inode))
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	err = __nilfs_read_inode(sb, root, ino, inode);
	if (unlikely(err)) {
		iget_failed(inode);
		return ERR_PTR(err);
	}
	unlock_new_inode(inode);
	return inode;
}


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Total110100.00%5100.00%






struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
				__u64 cno)
{
	struct nilfs_iget_args args = {
		.ino = ino, .root = NULL, .cno = cno, .for_gc = 1
	};
	struct inode *inode;
	int err;

	inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
	if (unlikely(!inode))
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	err = nilfs_init_gcinode(inode);
	if (unlikely(err))